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Selenium Requirement For Oligodendrocyte Differentiation., Jin Gu

Graduate Theses, Dissertations, and Problem Reports (ETD)

Selenium is a nutritionally essential trace element for mammals, and several studies have suggested that selenium may have an important function in the central nervous system. We hypothesized that selenium may play an important role in the differentiation of myelin producing cells, i.e., oligodendrocytes in developing brain. We employed an in vitro model system of glial cell cultures prepared from newborn rat brains to test this hypothesis. In mixed glial cell cultures, selenium deficiency inhibited developmental upregulation of myelin-specific genes, i.e., proteolipid protein (PLP), basic protein (BP) and myelin-associated glycoprotein (MAG) as assessed by Northern blot analysis. The effect of …

Mechanisms Of Absorption And Metabolism Of Peptide Drugs In The Lung., Meenakshi G. Bhat

Graduate Theses, Dissertations, and Problem Reports (ETD)

The pulmonary delivery of peptide drugs involves an understanding of the barriers to absorption which include poor permeability, potential activation of alveolar macrophages (AMs) and enzymatic degradation. The aim of the study is to develop methodologies to study the relative nature of respiratory tract epithelia. The dynamics of its regulation are also studied for examining the feasibility of achieving reversible increases in paracellular permeability. Transepithelial electrical resistance (TER) measurements coupled with flux studies of C-14 Mannitol were conducted employing isolated epithelial tissue from rabbits for estimation of comparative permeabilities. The dynamics of paracellular permeability was studied employing 0.1 mM cytochalasin …

Wildflowers For Indiana Highways, Michael N. Dana, Ricky Darrell Kemery, Brian S. Boszor

JTRP Technical Reports

Questions concerning wildflower usage on Indiana highway rights-of-way were investigated. Native prairie wildflower seed quality was found to be highly variable among supply companies, species, and years. Less variability was found among “garden” wildflower species and suppliers. Direct seeding was found to be successful with six species of native prairie forbs: Butterfly Milkweed Asclepiads tuberose, Wild Bergamot Monarda fistulosa, New England Aster Aster novae-angliae, Pale-purple Coneflower Echinacea pallida, Gray-headed Coneflower Ratibido pinnota, Ironweed Vernonia fasciculosa. Five species of “garden” wildflowers performed well: Common Cosmos Cosmos bipinnatus, Yellow Cosmos Cosmos sulphureus, Cornflower Centaurea cyanus, Goldenwave Coreopsis sincioria, Black-eyed Susan Rudbeckia hiria. …

Table Of Contents (Vol. 67, Issue 2)

University of Colorado Law Review

No abstract provided.

Habitat Conservation Planning Under The Endangered Species Act : No Surprises & The Quest For Certainty, Eric Fisher

University of Colorado Law Review

No abstract provided.

Animal Welfare Reform And The Magic Bullet: The Use And Abuse Of Subtherapeutic Doses Of Antibiotics In Livestock, Barbara O'Brien

University of Colorado Law Review

No abstract provided.

Rationalizing The Constitution, Steven D. Smith

University of Colorado Law Review

No abstract provided.

The Double-Edged Sword: Admissibility Of Battered Women Syndrome By And Against Battered In Cases Implicating Domestic Violence, Myrna S. Raeder

University of Colorado Law Review

No abstract provided.

O.J. Simpson & The Myth Of Gender/Race Conflict, Nancy S. Ehrenreich

University of Colorado Law Review

No abstract provided.

The Simpson Affair, Reform Of The Criminal Justice Process, And Magic Bullets, Ronald J. Allen

University of Colorado Law Review

No abstract provided.

A Semiquantitative Analysis Of Pcb And P,P-Dde Residues In Stranded Marine Mammals Using High Performance Liquid Chromatography, David Lawrence Hayteas

Dissertations and Theses

Organochlorines are ubiquitous pollutants of the marine environment. These lipid-soluble and highly persistent compounds are found in detectable amounts in almost all marine organisms, and accumulate in the lipid tissues of marine animals. This bioaccumulation leads to biomagnification of these contaminants in higher trophic levels. Near the top of many marine food chains are found the marine mammals, in whose blubber high levels of organochlorine residues have been measured. The most commonly occurring of these pollutants in these animals are the polychlorinated biphenyls (PCB's) and p,p-DDE, a metabolite of the insecticide DDT. These substances have been shown to cause disruptions …

Numerical Chromosome Abnormalities In Sperm From Oligoasthenoteratozoospermic Patients And Fertile Males, Myung-Geol Pang

Theses and Dissertations in Biomedical Sciences

Artificial fertilization protocols have been developed which bypass natural barriers for reproduction. One aspect of infertility which has received little attention is the potential importance of aneuploidy in sperm. To more clearly understand the cytogenetic make-up of sperm from OAT patients, multi-probe, multi-color FISH was performed to determine aneuploidy.

The introduction of intracytoplasmic sperm injection (ICSI) has revolutionized protocols used in in vitro fertilization centers. The pregnancies resulting from ICSI suggest an increased frequency of sex chromosome aneuploidy in livebirths. Preliminary data by others' suggest that sperm tail swelling patterns following hypo-osmotic swelling (HOST) can be predictive of fertilizing ability. …

Wapato For The People : An Ecological Approach To Understanding The Native American Use Of Sagittaria Latifolia On The Lower Columbia River, Melissa Cole Darby

Dissertations and Theses

Sagittaria latifolia Willd. was an important root food and trade commodity for the Indians who lived along the Lower Columbia River in early historic times. This plant was prolific in the extensive wetlands of the Lower Columbia from about the great Cascades to the Kalama River. The tubers of this plant were called "wapato" in Chinook Jargon, the local trade language. The wetlands, and this plant that grew there, occupied a vast extent of the Lower Columbia territory; so much so that this valley was named 'Wapato Valley' by Lewis and Clark in 1805. This thesis will provide pertinent information …

Invisible Walls: Milliken V. Bradley And America's Urban Apartheid, Sonia E. Ingles

Dissertations and Theses @ UNI

In 1954 the Supreme Court's Brown v. Board of Education ruling nullified the Plessy v. Ferguson (1896) doctrine of "separate but equal." At the time, a racially dysfunctional America looked to the South to observe the results of the Court's sweeping statement. Few realized that, carried to its logical conclusion, the decision would necessarily bring into question the racial practices of every part of the nation. To the dismay of Northerners, blacks began to challenge the unofficial system of segregation which existed outside of the South. The most controversial aspect of this challenge centered around school desegregation and busing. When …

Ultrastructural Changes In The Milk Gland Of Tsetse Glossina Morsitans Centralis (Diptera; Glissinidae) Female Infected By A Dna Virus, Rosemary C. Sang, Walter G.Z.O. Jura, Leonard H. Otieno, Peter Ogaja

All Peer-Reviewed Publications

Milk glands, dissected out and collected from Glossina morsitans centralis (Machado) females, artificially inoculated at the third-instar larval stage with a virus suspension obtained from hypertrophied salivary glands of wild-caught virus-infected Glossina pallidipes (Austen), were processed for routine electron microscopy and examined for pathological changes. They were compared to milk glands dissected out from normal female G.m. centralis at the same stage of pregnancy cycle. Upon dissection there were notable physical differences between control and virus-infected milk glands. Histologically, some areas of the gland developed severe degeneration while other areas developed less severe pathological changes. Ultrastructural studies revealed the presence …

Functional Morphology And Anatomy Of The Polypneustic Lobes Of The Last Larval Instar Of Tsetse Flies, Glossina Spp. (Diptera: Glossinidae), Jan Žďárek, František Weyda, Mathayo M.B. Chimtawi, David L. Denlinger

All Peer-Reviewed Publications

This study examines the external and internal anatomy of the polypneustic (respiratory) lobes in 8 species of tsetse larvae (Diptera: Glossinidae). In the more primitive fusca group, the respiratory lobes are either ring-like (Glossina longipennis) or partially divided into 2 lobes (G. brevipalpis). Two distinctly separated lobes are present in the palpalis group (G. palpalis, G. tachinoides, G. fuscipes) and in the morsitans group (G. morsitans, G. pallidipes, G. austeni). Air enters the polypneustic lobes through narrow slits (stigmata) on the tips of numerous small spiracular papillae that are arranged in rows on both the outer and inner surfaces of …

Comparison Of Resistance In Three Breeds Of Cattle Against African Ixodid Ticks, G. Solomon, G. P. Kaaya

All Peer-Reviewed Publications

Tick resistance in three breeds of cattle, two indigenous breeds (Arssi and Boran) and one Boran × Friesian cross-breed, were compared following natural tick infestations at Abernossa ranch in Ethiopia. The local Arssi breed was found to have the highest tick resistance, followed by the Boran breed, whereas the Boran × Friesian was the least resistant. Over a period of 12 months, from October 1991 to September 1992, a total of 32 897 ticks composed of four genera were collected from the animals. The four most abundant tick species were Amblyomma variegatum (61.7%), Boophilus decoloratus (16%); Rhipicephalus evertsi evertsi (16.3%) …

Genetics Of Resistance To Aphis Craccivora In Cowpea, S. M. Githiri, K. Ampong-Nyarko, E. O. Osir, P. M. Kimani

All Peer-Reviewed Publications

Inheritance of aphid resistance and allelic relationships among sources of resistance was studied in the parents, F1, F2, F3, and backcross populations of cowpea crosses. Each 4-day old seedling was infested with five fourth-instar aphids. Seedling reaction was recorded 14-16 days after infestation when the susceptible check was killed. The segregation data from eight crosses between resistant and susceptible cowpea cultivars indicated that aphid resistance was inherited as a monogenic dominant trait. Segregation data from crosses among eight resistant cultivars indicated that one or two loci and modifier(s) were involved in the expression of resistance to aphids. It was suggested …

Identification Of Major Components Of Larviposition Pheromone From Larvae Of Tsetse Flies Glossina Morsitans Morsitans Westwood And Glossina Morsitans Centralis Machado, R. K. Saini, A. Hassanali, J. Andoke, P. Ahuya, W. P. Ouma

All Peer-Reviewed Publications

The presence of pheromones produced by larvae of Glossina morsitans morsitans and G. m. centralis, respectively, which attract gravid females and result in aggregation of pupae, is confirmed. Behavioral experiments indicated that females preferred to larviposit over moist sand conditioned by previously allowing larvae to pupariate in it. Similar results were obtained with filter papers contaminated with the prepupariation excretions of larvae and with volatiles collected from larvae prior to pupariation. n-Pentadecane and n-dodecane were identified as the dominant electrophysiologically active components of the larviposition pheromones of G. m. morsitans and G. m. centralis, respectively, by GC-EAD and GC-MS analysis …

Chemoecological Role Of Mammalian Urine In Host Location By Tsetse, Glossina Spp. (Diptera: Glossinidae), L. Chuka Madubunyi, A. Hassanali, W. Ouma, D. Nyarango, J. Kabii

All Peer-Reviewed Publications

Trap catch size was used to investigate whether Glossina pallidipes and G. longipennis could distinguish between the urine of the African buffalo, cattle, and waterbuck at Nguruman in southwest Kenya, NG2G traps baited with aged urine of these bovids caught significantly more of each tsetse than did the controls. The mean catch of either tsetse species in traps baited with aged urine of buffalo and cattle (tsetse hosts) and waterbuck (a nonhost) did not differ significantly. Aged urine from both tsetse hosts (buffalo and cattle) and the nonhost (waterbuck) was found to contain 4-cresol and 3-n-propylphenol in about the same …

Reproductive Responses Of Iphiseius Degenerans And Neoseiulus Teke (Acari: Phytoseiidae) To Changes In The Density Of The Cassava Green Mite, Mononychellus Tanajoa (Acari: Tetranychidae), F. E. Nwilene, G. Nachman

All Peer-Reviewed Publications

We assessed the reproductive responses of adult female Iphiseius degenerans and Neoseiulus teke to increasing density of three stages of their prey, Mononychellus tanajoa, on cassava leaf discs under laboratory conditions. The oviposition rates increased with number of prey consumed per predator per day with a maximum of approximately two eggs per day for I. degenerans and four eggs per day for N. teke. The oviposition rate of N. teke was higher when consuming eggs than other prey stages. Neoseiulus teke was more efficient than I. degenerans in converting consumed prey into egg production. The data were adequately described by …

Reproductive Performance And Population Dynamics Of Cowpea Aphid (Homoptera: Aphididae) On Leaf Extracts Of Resistant And Susceptible Cowpeas, I. Billy Annan, Ward M. Tingey, George A. Schaefers, Kailash N. Saxena

All Peer-Reviewed Publications

Membrane feeding studies were conducted to determine the effects of raw juices and chemical extracts of leaves of aphid-resistant (ICV-12) and aphid- susceptible (ICV-1) cultivars of cowpea [Vigna unguiculata L. (Walp.)], on the survival, growth, and reproduction of cowpea aphid Aphis craccivora Koch. Life table and demographic statistics of the cohort population and subsequent generations were estimated. Compared to ICV-1, the leaf juices and chemical extracts of ICV-12 exhibited significant (P ≤ 0.05) adverse effects on aphid survival, growth, and reproduction. Raw leaf juice and ethyl acetate extract of ICV-12 in both water and sucrose significantly (P ≤ 0.05) limited …

Functional Responses Of Iphiseius Degenerans And Neoseiulus Teke (Acari: Phytoseiidae) To Changes In The Density Of The Cassava Green Mite, Mononychellus Tanajoa (Acari: Tetranychidae), F. E. Nwilene, G. Nachman

All Peer-Reviewed Publications

The functional responses of pintonymph and adult female Iphiseius degenerans and Neoseiulus teke to increasing density of three stages of their prey, the cassava green mite (CGM), Mononychellus tanajoa, were studied on excised cassava leaf discs under laboratory conditions. The responses obtained were predominantly sigmoid type III curves with the highest plateau when both stages of I. degenerans and N. teke were preying on CGM eggs. In all cases, the predation rate of the former species exceeded that of the latter. The empirical data were fitted by four different models. From the models, the attack coefficient (a') and handling time …

Distribution Of Baird's Pocket Gopher (Geomys Breviceps) In Arkansas; With Additional County Records, Douglas A. Elrod, Gary A. Heidt, Mark R. Ingraham, Earl G. Zimmerman

Journal of the Arkansas Academy of Science

Recently, a population of pocket gophers in the north-central portion of Arkansas was determined to be the plains pocket gopher (Geomys Imrsarius), rather than Baird's pocket gopher (Geomys breviceps). This changed the known range of both species extensively. A detailed examination of the known range of Baird's pocket gophers (G. breviceps) in Arkansas resulted in 12 new county records. Biogeographically, G. breviceps appears to be found in all physiographic regions within the state with the possible exception ofCrowley's ridge. It is most common in the Gulf Coastal Plain and rarest in the Mississippi Alluvial Plain. The distribution ofG. breviceps is …